This is up to you. But, my opinion is that you should definitely play ME1 first.
You get a better feel on the Mass Effect Universe, and you will be more attached to the game, and will enjoy ME2 a lot more.
Mass Effect 1 is a great game, as is Mass Effect 2, but if you have the time and the money, play ME1 first.
It is pretty fun, but if you are old enough, you should play Mass Effect.
Mass Effect and Mass Effect 2 are both single player. There are no multiplayer modes
Yes.
Yes. Mass effect one is available on the play station three.
No. That's a single player game.
If you want to, and you're into video games. Try reading a few online reviews about it.
If you don't import a save game from Mass Effect, you will automatically choose the character of the opposite gender to survive. If you play Mass Effect first, though, you can choose if you want Ashley or Kaidan to survive. So to play Mass Effect 2 as a female and with Ashley alive, you would have to play Mass Effect and let Kaidan die on Virmire.
You won't be able to import your save game from ME1.
No, the player can only play as a Human in Mass Effect 2. The player can, however, date non-humans.
Not all of them. Maybe one or two of them, but all four games will not fit on a 4 gig hard drive.
It doesn't but it does have downloadable content.
Not in the main game, however in Mass Effect 3 Multiplayer one is free to play an alien race assuming it has been unlocked